| Abstract: | We review metabolizable energy (ME) concepts and present evidence suggesting that the form of ME used for analyses of avian energetics can affect interpretation of results. Apparent ME (AME) is the most widely used measure of food energy available to birds. True ME (TME) differs from AME in recognizing fecal and urinary energy of nonfood origin as metabolized energy. Only AME values obtained from test birds fed at maintenance levels should be used for energy analyses. A practical assay for TME has shown that TME estimates are less sensitive than AME to variation in food intake. The TME assay may be particularly useful in studies of natural foods that are difficult to obtain in quantities large enough to supply test birds with maintenance requirements. Energy budgets calculated from existence metabolism should be expressed as kJ of AME and converted to food requirements with estimates of metabolizability given in kJ AME/g. Energy budgets calculated from multiples of basal metabolic rate (a component of maintenance energy), however, should be expressed as kJ of either TME or net energy depending on ambient temperature. Energy units should be stated explicitly to improve comparability and in some cases accuracy of energy analyses. |
| Genre: | Article |
| ProdID: | 1001378 |
| Citation Author: | Miller, M. R.; Reinecke, K. J. |
| Citation Contributing Office: | Northern Prairie Wildlife Research Center |
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| Citation End Page: | 400 |
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| Citation Language: | English |
| Citation Larger Work Title: | Condor |
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| Citation Number Of Pages: | 4 |
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| Citation Phsyical Description: | p. 396-400 |
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| Citation Search Results Text: | Proper expression of metabolizable energy in avian energetics; 1984; Article; Journal; Condor; Miller, M. R.; Reinecke, K. J. |
| Citation Start Page: | 396 |
| Citation Volume: | 86 |
| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | Proper expression of metabolizable energy in avian energetics; 1984; Article; Journal; Condor; Miller, M. R.; Reinecke, K. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1984 00:00 -0600 |
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